To convert 70 psi (pounds per square inch) to kg/cm2 (kilograms per square centimeter), you can use the following conversion factor:

1 psi = 0.070307 kg/cm2

So, 70 psi can be converted to kg/cm2 as follows:

70 psi x 0.070307 kg/cm2 = 4.92149 kg/cm2 (approximately)

Therefore, 70 psi is approximately equal to 4.92149 kg/cm2.